CS5535 datasheet(395/555 Pages) NSC

395 / 555 page

Revision 0.8

395

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UART/IR Controller Register Descriptions (Continued)

5.12.10.2 IR Transmitter Modulator Control Register (IRTXMC)

IRTXMC selects the modulation subcarrier parameters for CEIR and Sharp-IR mode transmission. For Sharp-IR, only the

subcarrier pulse width is controlled by this register; the subcarrier frequency is fixed at 500 kHz.

After reset, the value of this register is 69h, selecting a carrier frequency of 36 kHz and an IR pulse width of 7 µs for CEIR,

or a pulse width of 0.8 µs for Sharp-IR.

I/O Offset

01h

Type

R/W

Reset Value

69h

IRTXMC Bit Map

MCPW[2:0]

MCFR[4:0]

IRTXMC Bit Descriptions

Bit

Name

Description

7:5

MCPW[2:0]

Modulation Subcarrier Pulse Width. Specifies the pulse width of the subcarrier clock,

as shown in Table 5-49. (Default = 011.)

4:0

MCFR[4:0]

Modulation Subcarrier Frequency. These bits set the frequency for the CEIR modula-

tion subcarrier. The encoding is defined in Table 5-50. (Default = 01001.)

Table 5-49. Modulation Carrier Pulse Width

MCPW[2:0]

Low Frequency (TXHSC = 0) (CEIR only)

High Frequency (TXHSC = 1) (CEIR or Sharp-IR)

0 0 0

Reserved

0 0 1

Reserved

0 1 0

6.0 µs

0.7 µs

0 1 1

7.0 µs

0.8 µs

1 0 0

9.0 µs

0.9 µs

1 0 1

10.6

µs

Reserved

1 1 0

Reserved

1 1 1

Reserved

Table 5-50. CEIR Carrier Frequency Encoding

MCFR[4:0]

Low Frequency (TXHSC = 0)

High Frequency (TXHSC = 1)

00000

Reserved

00001

Reserved

00010

Reserved

00011

30 kHz

400 kHz

00100

31 kHz

Reserved

00101

32 kHz

Reserved

00110

33 kHz

Reserved

00111

34 kHz

Reserved

01000

35 kHz

450 kHz

01001

36 kHz

Reserved

01010

37 kHz

Reserved

01011

38 kHz

480 kHz

01100

39 kHz

Reserved

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